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Physiological Response of Three Species of Bush to Drought Stress

CHAI Wei-wei et al(College of Forestry,Gansu Agricultural University,Gansu,Lanzhou 730070)  
The physiological adaptability mechanism of Tamarix chinensis seedlings,Haloxylon ammodendron seedlings and Atriplex canescens(pursh)Nutt seedlings under drought stress were studied.The changes of relative water content,water deficit,activity of superoxide dismutase(SOD),catalase(CAT),peroxidase(POD) and the contents of soluble protein in plant were measured.Results showed that with the increase of drought stress intensity,RWC of these three bushes decreased,and the water deficits increased.The activity of protective enzyme system increased,but there were significant differences in the tendency and extent.Meanwhile the proline as osmoregulation matters was accumulated.These three species of bush all had powerful ability in adapting to drought stress,but they had different drought resistance mechanism.
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